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Fly Ash and GGBS Based Geopolymer as Alternate Binder for Treating Soft Soils
Soft clay deposits suffer from inadequate strength with high compressibility due to its high natural water content close to liquid limit. Soft clays are conventionally stabilised with ordinary Portland cement (OPC) or lime additions in many ground improvement works. The manufacturing processes of these traditional stabilisers are highly energy intensive and emit significant amounts of CO2. Geopolymer is a promising alternative to these stabilisers, as it gives high strength, consumes low energy, and emits low CO2 during synthesis and application. In this study, geopolymer synthetized from mixture of fly ash, Ground Granulated Blast Furnace Slag (GGBS), and alkaline sodium hydroxide (NaOH) solution was used to stabilize soft clay. The performance of geopolymer is compared with cement mixed with clay, by evaluating their unconfined compressive strength (UCS) properties. The study is carried out with different contents of binder (prepared by varying percentage of fly ash and GGBS) and 8 M NaOH alkaline activator solution, with activator to binder ratio of 1. From this study, it is found that up to 20% binder content, UCS values of stabilised soil mixes have increased significantly, and then the rate of strength gain is slightly reduced. Furthermore, for a given binder content, UCS values increased as the proportion of GGBS to fly ash increased. This study further depicted that geopolymer synthesised from optimum mixture of fly ash and GGBS are superior to cement stabilised soils and hence can be a promising alternative to traditional stabilisers.
Fly Ash and GGBS Based Geopolymer as Alternate Binder for Treating Soft Soils
Soft clay deposits suffer from inadequate strength with high compressibility due to its high natural water content close to liquid limit. Soft clays are conventionally stabilised with ordinary Portland cement (OPC) or lime additions in many ground improvement works. The manufacturing processes of these traditional stabilisers are highly energy intensive and emit significant amounts of CO2. Geopolymer is a promising alternative to these stabilisers, as it gives high strength, consumes low energy, and emits low CO2 during synthesis and application. In this study, geopolymer synthetized from mixture of fly ash, Ground Granulated Blast Furnace Slag (GGBS), and alkaline sodium hydroxide (NaOH) solution was used to stabilize soft clay. The performance of geopolymer is compared with cement mixed with clay, by evaluating their unconfined compressive strength (UCS) properties. The study is carried out with different contents of binder (prepared by varying percentage of fly ash and GGBS) and 8 M NaOH alkaline activator solution, with activator to binder ratio of 1. From this study, it is found that up to 20% binder content, UCS values of stabilised soil mixes have increased significantly, and then the rate of strength gain is slightly reduced. Furthermore, for a given binder content, UCS values increased as the proportion of GGBS to fly ash increased. This study further depicted that geopolymer synthesised from optimum mixture of fly ash and GGBS are superior to cement stabilised soils and hence can be a promising alternative to traditional stabilisers.
Fly Ash and GGBS Based Geopolymer as Alternate Binder for Treating Soft Soils
Lecture Notes in Civil Engineering
Vilventhan, Aneetha (editor) / Singh, Shamsher Bahadur (editor) / Delhi, Venkata Santosh Kumar (editor) / Gaddam, Aravind Goud (author) / Varudu, Ramana Murthy (author) / Yamsani, Sudheer Kumar (author)
National conference on Advances in Construction Materials and Management ; 2022 ; Warangal, India
2023-07-31
8 pages
Article/Chapter (Book)
Electronic Resource
English
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